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Long-term Debt and Short-term Borrowings (Narrative) (Details) € in Millions, $ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Nov. 10, 2020 USD ($) | May 23, 2019 USD ($) | Jul. 26, 2018 USD ($) | Jan. 27, 2017 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 01, 2020 USD ($) | Apr. 30, 2020 | May 22, 2019 USD ($) | Jan. 27, 2017 EUR (€) | Jan. 27, 2017 AUD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 1,136.6 | $ 816.0 |  |  |  |  |  |
Maximum Consolidated Leverage Ratio |  |  |  |  |  |  |  |  |  | 3.75 |  |  |
Debt issuance costs |  |  |  |  |  | 3.2 | 3.4 | $ 0.6 |  |  |  |  |
Senior Secured Credit Facility Due January 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, term |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Senior Secured Notes | Euro Term Loan A |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, face amount |  |  |  |  | $ 320.8 |  |  |  |  |  |  | € 300.0 |
Senior Secured Notes | AUD Term Loan A |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Max borrowing capacity |  |  |  |  | 60.4 |  |  |  |  |  |  |  | $ 80.0
Senior Secured Notes | USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.50% at December 31, 2020 and 3.44% at December 31, 2019) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  | $ 100.0 |  |  | 92.5 | 97.5 |  |  |  |  |  |
Senior Secured Notes | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 3.2 |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes | Minimum | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payment, based on annual percentage |  |  | 1.25% |  |  |  |  |  |  |  |  |  |
Senior Secured Notes | Forecast | Maximum | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payment, based on annual percentage | 2.50% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | 375.0 | $ 375.0 |  |  |  |  |  |
Senior Secured Credit Facility Due January 2022 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  |  |  |  |  |  |  |  | 2.50 |  |
Senior Secured Credit Facility Due January 2022 | Senior Secured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  | 1.25 |  |
Revolving Facility | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Max borrowing capacity |  |  |  |  | 400.0 |  |  |  |  |  |  |  |
Revolving Facility | Senior Secured Notes | Senior Secured Credit Facility Due January 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Max borrowing capacity |  |  |  | $ 500.0 |  |  |  |  |  |  | $ 500.0 |  |
Credit facility, increase |  |  |  | $ 100.0 |  |  |  |  |  |  |  |  |
Revolving Facility | Senior Secured Notes | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Max borrowing capacity |  |  | $ 600.0 |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | 332.6 |  |  |  |  |  |  |
Amount available for borrowings under the Restated Revolver Facility |  |  |  |  |  | 256.8 |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | $ 10.6 |  |  |  |  |  |  |
Commitment fee percent |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Revolving Facility | Senior Secured Notes | Minimum | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percent |  |  |  |  |  | 0.20% |  |  |  |  |  |  |
Revolving Facility | Senior Secured Notes | Maximum | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percent |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Revolving Facility | Senior Secured Notes | Euro Floor | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate percent |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Revolving Facility | Senior Secured Notes | U.S. Floor | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate percent |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Coverage Ratio |  |  |  |  |  | 5.44 |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  | 3.25 |  |  |  |  |  |  |  |  |  |
Maximum Consolidated Leverage Ratio |  |  |  |  |  | 4.75 |  |  | 4.75 |  |  |  |
Maximum Consolidated Leverage Ratio, decrease |  |  |  |  |  |  |  |  |  | 3.75 |  |  |
Facility paydown when cash and cash equivalents exceed, amount |  |  |  |  |  |  |  |  | $ 100.0 |  |  |  |
Amended maximum Consolidated Leverage Ratio |  | 0.50 |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 4.30 |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.50% |  |  |  |  |  |  |  |  |  |  |
Dividends and/or purchase shares, threshold |  |  |  |  |  | $ 30.0 |  |  |  |  |  |  |
Dividends and/or purchase shares, threshold, percent of total assets |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Minimum leverage ratio for payment of dividends or repurchase of shares |  |  |  |  |  | 3.25 |  |  |  |  |  |  |
Consolidated Leverage Ratio, greater than |  |  |  |  |  | 3.75 |  |  |  |  |  |  |
Maximum borrowing capacity, potential increase |  |  |  |  | $ 500.0 |  |  |  |  |  |  |  |
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes | Senior Secured Credit Facility Due May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  | 3.25 |  |  |  |  |  |  |  |  |  |
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Coverage Ratio |  |  | 3.00 |  |  | 3.00 |  |  |  |  |  |  |
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and/or purchase shares, threshold |  |  |  |  |  | $ 75.0 |  |  |  |  |  |  |

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